<template>
    <div>
         <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片视图区域 -->
      <el-card>
        <!-- 提示区域 -->
          <el-alert title="添加商品信息" type="info" show-icon center :closable="false">
          </el-alert>
          <!-- 步骤条 -->
          <el-steps :active="activeName-0" align-center finish-status="success">
            <el-step title="基本信息" ></el-step>
            <el-step title="商品参数" ></el-step>
            <el-step title="商品属性" ></el-step>
            <el-step title="商品图片" ></el-step>
            <el-step title="商品内容" ></el-step>
            <el-step title="完成" ></el-step>
          </el-steps>

          <!-- tabs页签 -->
          <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <el-tabs :tab-position="'left'" v-model="activeName" :before-leave="beforeTabLeave" @tab-click="tabClicked">
              <el-tab-pane label="基本信息" name="0">
                 <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                 </el-form-item>
                 <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" type="number"></el-input>
                 </el-form-item>
                 <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight" type="number"></el-input>
                 </el-form-item>
                 <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number" type="number"></el-input>
                 </el-form-item>
                 <el-form-item label="商品分类" prop="goods_cat">
                    <el-cascader v-model="addForm.goods_cat" :options="catelist" :props="cateProps" @change="handleChange">
                    </el-cascader>
                 </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品参数" name="1">
                <!-- 渲染表单的item项 -->
                 <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                    <el-checkbox-group v-model="item.attr_vals" >
                      <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox >
                    </el-checkbox-group>
                 </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品属性" name="2">
                <!-- 渲染静态属性的item项  -->
                  <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                     <el-input v-model="item.attr_vals" ></el-input>
                  </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品图片" name="3">
                <!-- action表示图片要上传到后台的API地址 -->
                 <el-upload
                    :action="uploadURL"
                    :on-preview="handlePreview"
                    :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                    <el-button size="small" type="primary">点击上传</el-button>
                  </el-upload>
              </el-tab-pane>
              <el-tab-pane label="商品内容" name="4">
                <!-- 富文本编辑器 -->
                <quill-editor v-model="addForm.goods_introduce">
                </quill-editor>
                <!-- 添加商品的按钮 -->
                <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
              </el-tab-pane>
            </el-tabs>
          </el-form>
      </el-card>

      <!-- 图片预览的对话框 -->
      <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
          <img :src="previewPath" alt="" class="previewImg">
      </el-dialog>
    </div>
  </template>

<script>
import _ from 'lodash'
export default {

  data () {
    return {
      activeName: '0',
      // 要绑定的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类列表
        goods_cat: [],
        // 保存图片上传临时路劲的数组 因为提交表单需要
        pics: [],
        // 商品的详情介绍
        goods_introduce: '',
        attrs: []
      },

      // 表单数据对象的验证规则
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请输入商品分类', trigger: 'blur' }]

      },

      // 商品分类数据列表
      catelist: [],
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },

      // 动态参数列表
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],

      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 手动为上传图片设置header请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },

      previewVisible: false,
      previewPath: '',
      // 商品的详情描述
      goods_introduce: ''
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('商品分类列表获取失败!')
      }
      this.$message.success('商品分类列表获取成功')
      // console.log(res)
      this.catelist = res.data
    },

    // 级联选择器选中项变化  会出发这个函数
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },

    beforeTabLeave (activeName, oldActiveName) {
      // console.log('即将离开的' + oldActiveName)
      // console.log('即将进入的' + activeName)
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择三级分类')
        return false
      }
    },
    // tab栏被点击时  触发的事件
    async tabClicked () {
      // console.log(this.activeName) 打印的结果是 索引值
      // 证明访问的是动态参数面板
      if (this.activeName === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })

        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败!')
        }
        console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
        })
        this.manyTableData = res.data
      } else if (this.activeName === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })

        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败!')
        }
        console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    // 图片预览
    handlePreview (file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },

    // 图片移除
    handleRemove (file) {
      // console.log(file)
      const filePath = file.response.data.tmp_path
      // 数组的findIndex方法，是查找当前符合条件的索引
      const i = this.addForm.pics.findIndex(item =>
        item.pic === filePath
      )
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 图片上传成功
    handleSuccess (response) {
      // console.log(response)
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },

    // 点击添加商品按钮事件
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }

        // 否则执行添加的业务逻辑
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        console.log(form)

        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(',') }
          this.addForm.attrs.push(newInfo)
        })

        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)
        // 发起请求  添加商品
        const { data: res } = await this.$http.post('goods', form)

        if (res.meta.status !== 201) {
          return this.$message.error('添加失败！')
        }
        this.$message.success('添加成功')
        this.$router.push('/goods')
      })
    }

  },

  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>

.el-checkbox{
  margin:0 5px 0 0 !important;
}

.previewImg{
  width: 100%;
}

.btnAdd{
  margin-top: 15px
}
</style>
